JP3272426B2 - Endoscope injection needle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle for an endoscope which is inserted into a forceps channel of an endoscope and punctured the inner wall of a body cavity.

[0002]

2. Description of the Related Art In an endoscope needle of this type, a flexible tube having a distal end to which an injection needle is connected is disposed in a flexible outer tube so as to be able to advance and retreat. It comes in and out from the tip.

[0003]

When puncturing a gastrointestinal tract wall such as the stomach or esophagus, a considerably large puncturing force is required. In particular, in the case of an injection needle used for an ultrasonic endoscope, since it is necessary to puncture a deep organ through the digestive tract wall, a larger puncture force is required.

However, in the conventional injection needle for an endoscope, since the puncturing force directly acts to compress the flexible tube in the axial direction, the flexible tube shrinks in the axial direction in the outer tube. In many cases, the puncture force was absorbed, and it was not possible to puncture a hard part of the digestive tract wall or deep organs well.

Accordingly, an object of the present invention is to provide an injection needle for an endoscope that can reliably puncture even a hard inner wall of a body cavity or a deep organ.

[0006]

In order to achieve the above object, an endoscope injection needle according to the present invention comprises a flexible tube having an injection needle connected to a distal end thereof, which is advanced and retracted into a flexible outer tube. Tube compression inhibiting means for preventing the flexible tube from being axially compressed in an endoscope injection needle arbitrarily arranged so that the injection needle enters and exits from the distal end of the outer tube. Is provided so as to be freely inserted into and removed from the flexible tube from the base end side of the flexible tube.

[0007] The tube compression inhibiting means may be a metal core arranged so that the distal end abuts on the proximal end of the injection needle. Further, the distal end of the tube compression inhibiting means may be inserted into the injection needle, and the tube compression inhibiting means may include a pipe member inserted into the flexible tube and a pipe member inserted between the pipe member. And a core material that is inserted into and removed from the core material.

[0008]

An embodiment will be described with reference to the drawings. FIG. 2 shows a flexible mantle tube unit 10.

Reference numeral 11 denotes a mantle tube comprising a coil pipe which forms substantially the entire length of the mantle tube unit 10. The mantle tube 11 is a flat stainless steel wire having a substantially rectangular cross section,
It is formed by tightly winding with the same diameter over the entire length,
It is used by being freely inserted into and removed from a forceps channel of an endoscope.

A distal end cap 12 having a small inner diameter is fixed to the distal end of the outer tube 11 by silver brazing or the like, and a large diameter outer base 13 is fixed to the proximal end of the outer tube 11. An O-ring 14 for clicking is fitted inside the base of the base 13.

FIG. 3 shows the injection needle unit section 20 inserted into the mantle tube 11. Reference numeral 21 denotes a flexible tube formed of, for example, a fluororesin tube, which forms substantially the entire length of the injection needle unit 20, and can be inserted into the outer tube 11 so as to be able to advance and retreat.

A metal injection needle 22 is press-fitted to the distal end of the flexible tube 21. 22a is the injection needle 2
2 is a stopper piece fixed to the outer surface of the injection needle 22 so as not to get into the flexible tube 21.

An injection mouthpiece 23 for connecting a syringe (not shown) is joined to the proximal end of the flexible tube 21. A so-called luer lock female cap 24 is formed on the outer end side of the injection cap 23.

When a syringe is connected to the female base 24 and a medicine or the like is pushed out from the syringe, the medicine or the like is sent out from the tip of the injection needle 22 through the flexible tube 21.

On the outer peripheral surface of the body of the injection cap 23, a pair of click circumferential grooves 25 and 26 for engaging with the O-ring 14 fitted in the hand base 13 are formed at intervals. I have.

Then, the injection needle unit 20 is inserted into the mantle tube unit 10 and the O-ring 1 is inserted into the inner groove 25.
In the first click state in which the O-ring 14 is engaged, the tip of the injection needle 22 is retracted into the outer tube 11, and in the second click state in which the O-ring 14 is engaged with the outer groove 26. As shown in FIG. 1, the injection needle 22 is
Is projected to the maximum (for example, 25 mm) from the front end cap 12.

FIG. 4 shows a stylet 31 (core) made of, for example, a stainless steel wire which is inserted into the flexible tube 21 so as to be detachable from the base end of the flexible tube 21 and is fixed to the base end. Shows a stylet unit 30 (tube compression preventing means) composed of the stylet base 32 provided.

The outer diameter of the tip of the stylet 31 is
2, the stylet base 32 is formed in a tapered shape that can be tightly fitted into the female base 24 of the injection base 23.

FIG. 1 shows an endoscope injection needle 1 in which a flexible tube 21 into which a stylet 31 is inserted is fully inserted into a mantle tube 11 so that an injection needle 22 is protruded to the maximum. This shows the use state.

In this state, the stylet cap 32 is tightly fitted to the female cap 24, and the stylet 31
Is slightly spaced from the proximal end of the injection needle 22 (e.g.
5mm).

Therefore, the presence of the stylet 31 strengthens the stiffness of the flexible tube 21 and the mantle tube 11 so that it is difficult to break, and at the same time, the injection needle 22 pierces the puncture target 1.
When the needle is punctured at 00, the rear end of the injection needle 22 that is about to be pushed into the mantle tube 11 collides with the tip of the stylet 31, and the injection needle 22 is not pushed any further, and is therefore flexible. Sex tube 21 is not compressed in the axial direction.

FIG. 5 shows an example of the usage state of the endoscope injection needle 1 of the above embodiment. The endoscope injection needle 1 is projected from the forceps channel 3 of the ultrasonic endoscope 2. The state is shown.

The digestive organ wall surface 101 to be punctured is optically observed through the observation window 4, and the deep organ 102 and the injection needle 22 to which the injection needle 22 is actually punctured and a medicinal solution or the like is injected are formed. The ultrasonic tomographic image is observed via the ultrasonic probe 5 as shown in FIG. A balloon 6 shown in FIG. 5 is inflated by being filled with degassed water or the like.

In the endoscope injection needle 1 of the present embodiment, even when the deep organ 102 is punctured from the gastrointestinal wall 101 in this manner, the presence of the stylet 31 makes the injection needle 22 Since the phenomenon that the flexible tube 21 is compressed by being pushed into the tube 11 does not occur, the puncture can be performed easily and reliably.

When the injection needle 22 is punctured at the target site, the stylet unit 30 is removed from the injection needle unit 20 and a treatment such as injection of a drug solution or collection of cells is performed.

After the treatment, the injection needle 22 is connected to the mantle tube 1
1, the click O-ring 14 is engaged with the inner groove 25, and the entire endoscope injection needle 1 is pulled out from the forceps channel 3 of the endoscope 2.

The stylet base 32 is formed in a so-called luer lock base, for example, as in the second embodiment shown in FIG. 7, and is mechanically engaged with the female base 24 of the injection base 23. It may be.

The stylet 31 may have a distal end portion 31a inserted into the injection needle 22, for example, as in the third embodiment shown in FIG. By doing so, at the time of puncturing, it is possible to prevent tissue on the surface of the organ from being mixed into the injection needle 22 and to purify the infused drug solution and the collected tissue.

Further, the stylet 31 is connected to a pipe material 31c which is connected to the stylet base 32 and is inserted into and removed from the flexible tube 21 as in the fourth embodiment shown in FIG. , And a core material 31d which is inserted into and removable from the pipe material 31c.

Numeral 34 indicates that the core 31d is set on the core 31d so as to contact the end of the stylet base 32 when the distal end of the core 31d is positioned at the distal end of the injection needle 22 as shown in FIG. This is a positioning rubber for positioning the core material 31d, and is formed so that the core material 31d is tightened to some extent.

As in the fourth embodiment, the stylet 3
1 is formed separately, the positioning rubber 34 can be removed and only the core material 31d can be pulled out to the front side.
As shown in FIG. 0, only the core material 31 d is
It can be placed in a state in which it is pierced into the pancreas 202, and can be used as a marker or the like during laparotomy.

[0032]

According to the injection needle for an endoscope of the present invention, the phenomenon that the flexible tube is compressed in the axial direction is prevented by the tube compression preventing means, so that it is ensured even in a hard body cavity inner wall or a deep organ. Can be punctured, and the treatment effect and the like can be greatly improved.

If the distal end of the tube compression preventing means is formed so as to be inserted into the injection needle, foreign substances are prevented from being mixed into the injection needle at the time of puncturing, and the infused drug solution and the collected tissue are made pure. If the tube compression preventing means is divided into a pipe material and a core material, a wider application can be obtained, such as leaving only the core material in a punctured state and leaving it in place.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an injection needle for an endoscope according to a first embodiment.

FIG. 2 is a side sectional view of a mantle tube unit according to the first embodiment.

FIG. 3 is a side sectional view of the injection needle unit according to the first embodiment.

FIG. 4 is a side view of the stylet unit of the first embodiment.

FIG. 5 is a schematic view showing a use state of the first embodiment.

FIG. 6 is a schematic diagram showing an ultrasonic tomographic image obtained in a use state of the first embodiment.

FIG. 7 is a side sectional view of a stylet unit according to a second embodiment.

FIG. 8 is a side sectional view of an injection needle unit and a stylet unit according to a third embodiment.

FIG. 9 is a side sectional view of an injection needle unit and a stylet unit according to a fourth embodiment.

FIG. 10 is a schematic diagram showing a use state of the fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection needle for endoscope 10 Outer tube unit part 11 Outer tube 20 Injection needle unit part 21 Flexible tube 22 Injection needle 30 Stylet unit part 31 Stylet 32 Stylet base

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61M 5/14 A61M 25/00

Claims (3)

(57) [Claims] 1. An endoscope in which a flexible tube having an injection needle connected to a distal end thereof is disposed so as to be able to advance and retreat in a flexible outer tube so that the injection needle can enter and exit from the distal end of the outer tube. a use injection needle, the tube compression preventing means for preventing the said flexible tube is compressed axially, inserted into the flexible tube from the proximal end side of the flexible tube detachably provided al
In the above, the tube compression preventing means is provided at the distal end of the proximal end of the injection needle.
An injection needle for an endoscope, wherein the injection needle is formed of a metal core arranged so as to be in contact with the endoscope. 2. The injection needle for an endoscope according to claim 1, wherein the distal end of said tube compression preventing means is inserted into said injection needle. 3. The tube compression preventing means includes a pipe member inserted into the flexible tube, and a core member inserted and removed through the pipe member. Or the injection needle for an endoscope according to 2.